<!DOCTYPE html>
<html>
<head>
<script src="../../../resources/js-test.js"></script>
<script src="../resources/common.js"></script>
</head>
<body>
<p id="description"></p>
<div id="console"></div>

<script>
description("Test bad inputs to HKDF deriveBits()");

jsTestIsAsync = true;

kHkdfKey = "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b";

var extractable = false;
Promise.resolve(null).then(function(result) {
    // Set up the test by creating an HKDF key...
    return crypto.subtle.importKey("raw", hexStringToUint8Array(kHkdfKey), {name: "HKDF"}, extractable, ['deriveKey', 'deriveBits']);
}).then(function(result) {
    hkdfKey = result;

    // ... and an ECDH key.
    return crypto.subtle.generateKey({name: "ECDH", namedCurve: "P-256"}, true, ['deriveBits']);
}).then(function(result) {
    ecdhKey = result;

    // Should throw a NotSupportedError if hash does not describe a recognized
    // algorithm that supports the digest operation.
    debug("\nderiveBits() with an unsupported hash...");
    return crypto.subtle.deriveBits({name: "HKDF", hash: "HMAC", salt: new Uint8Array(), info: new Uint8Array()}, hkdfKey, 8);
}).then(failAndFinishJSTest, function(result) {
    logError(result);

    // Should throw an InvalidAccessError if key doesn't match the algorithm
    debug("\nderiveBits() with an ECDH key...");
    return crypto.subtle.deriveBits({name: "HKDF", hash: "SHA-256", salt: new Uint8Array(), info: new Uint8Array()}, ecdhKey.privateKey, 8);
}).then(failAndFinishJSTest, function(result) {
    logError(result);

    // Should throw an OperationError if the key derivation operation
    // fails.  The key derivation operation will fail here because the length
    // is too long.
    //
    // The maximum length (in bytes) of output material for HKDF is 255 times
    // the digest length. In this case, the digest length (in bytes) of
    // SHA-256 is 32; 32*255 = 8160. deriveBits expects the length to be in
    // bits, so 8160*8=65280 and add 8 to exceed the maximum length.
    debug("\nderiveBits() with length of 65281...");
    return crypto.subtle.deriveBits({name: "HKDF", hash: "SHA-256", salt: new Uint8Array(), info: new Uint8Array()}, hkdfKey, 65288);
}).then(failAndFinishJSTest, function(result) {
    logError(result);

    // Use a bit length that is not a multiple of 8.
    debug("\nderiveBits() with length of 15...");
    return crypto.subtle.deriveBits({name: "HKDF", hash: "SHA-256", salt: new Uint8Array(), info: new Uint8Array()}, hkdfKey, 15);
}).then(failAndFinishJSTest, function(result) {
    logError(result);
}).then(finishJSTest, failAndFinishJSTest);

</script>

</body>
</html>
